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Cisco AIR-ANT2420V-N= Datasheet Page 14

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© 2014 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information. Page 14 of 88
Frequencies and Channel Sets
IEEE 802.11b/g Direct Sequence Channels
Fourteen channels are defined in the IEEE 802.11b/g direct-sequence channel set. Each direct-sequence channel
as transmitted is 22 MHz wide; however, the channel center separation is only 5 MHz. This leads to channel
overlap such that signals from neighboring channels can interfere with each other. In a 14-channel direct-sequence
system (11 usable in the United States), only three nonoverlapping (and hence, noninterfering) channels, 25 MHz
apart, are possible (for example, channels 1, 6, and 11).
This channel spacing governs the use and allocation of channels in a multiple-access-point environment such as
an office or campus. Access points are usually deployed in “cellular” fashion within an enterprise, where adjacent
access points are allocated nonoverlapping channels. Alternatively, access points can be collocated using
channels 1, 6, and 11 to deliver 33 Mbps bandwidth to a single area (but only 11 Mbps to a single client).
The channel allocation scheme is illustrated in Figure 9, and the available channels in the different regulatory
domains are defined in Table 4.
Figure 9. IEEE 802.11b/g DSSS Channel Allocations
Table 4 shows the channels permitted in the corresponding approval areas.
Table 4. DSSS PHY Frequency Channel Plan
Channel
ID
Frequency
(MHz)
Regulatory Domains (Maximum Conducted Average Power Levels in dBm)
-C
-E
-I
-J
-K
-N
-P
-S
-T
2400-2484 MHz
Mode
B
G
B
G
B
G
B
G
B
G
B
G
B
G
B
G
B
G
B
G
1
2412
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
2
2417
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
3
2422
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
4
2427
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
5
2432
X
X
X
X
X
X
X
X
X
X
X
X
X
17
X
X
X
X
X
X
6
2437
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
7
2442
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
8
2447
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
9
2452
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
17
10
2457
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
11
2462
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
12
2467
X
X
X
X
X
X
X
X
X
X
X
X
X
X
13
2472
X
X
X
X
X
X
X
X
X
X
X
X
X
X
14
2484
X
X
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